45
2. THE MASS OF THE ELECTRON
measured, as well as the accelerating voltage. Equation 2—8 of
'
the Eenard method is used to compute e/m.
,
C. Çazbde Ray Tuâe cmd Two Solenaids: Deection of an
'
.
electron beam in a tube whose axis is vertical is accomplished by
-
two long and narrow solenoids mounted horizontally on opposite
-
sides of the tube, near the deecting plates. Deections are
:
noted for a reversal of the current in the solenoids and for various
distances between their ends.
Extrapolation is then made to the
condition which would
exist if the coils could be placed end to end,
5
:
t
."
A
C
'
'
.
(:O t::0
.
|
.
\
|
…
1_
£
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\
.
E
,
G
\ \
F
|
.
,
'
-c
,+B
\
_
-
-
ÉË '
\\
FIG…2—15.
Alternate methods of measuring e/m
;_
_
the gap occupied by the tube. The extrapolated deection 18 used to compute r in equation 2—8 of the Lenard method.
Solenoids of sufcient diameter to produce a nearly uniform
eld
over the entire tube have been used
in a similar fashion.
DThomson
with &; Cat/zode Ray Tube: The principle
__
Section 2—2.
Two-transverse, coil‘s, _,a's in C'
_.
_
“fé-“used-V
,…
‘
,
…
«
…
‘
.
…
,
'
EClassenMhçid: ;:EleCtrons”Qm a—h9tiament are accelerç
Ï‘= »“
ated through
by: a strong
:a,îî,1l‘"
? magnetl°ddmt0asmaHCîrd€* (ZS—sr? 3cmrad1us) a They aré
Theeld 1”evefsed"leecmgth‘=c°«1ectr@nst°theoppüüî suie
2. THE MASS OF THE ELECTRON
measured, as well as the accelerating voltage. Equation 2—8 of
'
the Eenard method is used to compute e/m.
,
C. Çazbde Ray Tuâe cmd Two Solenaids: Deection of an
'
.
electron beam in a tube whose axis is vertical is accomplished by
-
two long and narrow solenoids mounted horizontally on opposite
-
sides of the tube, near the deecting plates. Deections are
:
noted for a reversal of the current in the solenoids and for various
distances between their ends.
Extrapolation is then made to the
condition which would
exist if the coils could be placed end to end,
5
:
t
."
A
C
'
'
.
(:O t::0
.
|
.
\
|
…
1_
£
'
\
.
E
,
G
\ \
F
|
.
,
'
-c
,+B
\
_
-
-
ÉË '
\\
FIG…2—15.
Alternate methods of measuring e/m
;_
_
the gap occupied by the tube. The extrapolated deection 18 used to compute r in equation 2—8 of the Lenard method.
Solenoids of sufcient diameter to produce a nearly uniform
eld
over the entire tube have been used
in a similar fashion.
DThomson
with &; Cat/zode Ray Tube: The principle
__
Section 2—2.
Two-transverse, coil‘s, _,a's in C'
_.
_
“fé-“used-V
,…
‘
,
…
«
…
‘
.
…
,
'
EClassenMhçid: ;:EleCtrons”Qm a—h9tiament are accelerç
Ï‘= »“
ated through
by: a strong
:a,îî,1l‘"
? magnetl°ddmt0asmaHCîrd€* (ZS—sr? 3cmrad1us) a They aré
Theeld 1”evefsed"leecmgth‘=c°«1ectr@nst°theoppüüî suie